chore(package.json): install devDependency mocha@^2.2.5
chore(package.json): install devDependency mocha@^2.2.5

rwjblue/broccoli-persistent-filter,jcope2013/broccoli-persistent-filter,broccolijs/broccoli-filter,stefanpenner/cauliflower-filter,caitp/cauliflower-filter,matthewjh/cauliflower-filter,chadhietala/broccoli-persistent-filter,chadhietala/cauliflower-filter,joliss/broccoli-filter,stefanpenner/broccoli-persistent-filter,csantero/broccoli-persistent-filter,joliss/cauliflower-filter